Bolbitius titubans

Bolbitius titubans, commonly known as the Yellow Fieldcap, or informally as the sunny side up, is a widespread species of gilled mushroom found on every continent excluding Antarctica. It belongs to the family Bolbitiaceae and is one of the most commonly recognizable mushrooms in open landscapes. This species was described by French mycologist Jean Baptiste Francois Pierre Bulliard in 1789 under the name Agaricus titubans. The Yellow Fieldcap is typically found in grassland habitats, meadows, and garden lawns where it fruits prolifically after periods of rain during the warm season. This mushroom can also be observed growing from straw, dung, and other decomposing organic matter highlighting its role as a saprotroph. Despite the common name "sunny side up" this mushroom is considered inedible primarily due to its thin, fragile flesh, which deteriorates rapidly. This mushroom is not known to be toxic....read more on Wikipedia.